#include <stdio.h>

int main(int argc,char *argv[])
{
	int i,j,m=0;
	for(i=1;i<=15;i+=4)//i=1 ,1<=15
	{
		for(j=3;j<=19;j+=4)//j=3,3<=19,j=7,7<=19
		{                  //j=11,11<=19 ,j=15,15<=19 
			m++;//m=1,m=2 ,m=3,m=4
		}
	}
	printf("%d\n",m);
	
	return 0;
}